EP3898175B1 - Dispositif de convoyage de préformes pour un four et procédé de commande d'un tel dispositif - Google Patents

Dispositif de convoyage de préformes pour un four et procédé de commande d'un tel dispositif Download PDF

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Publication number
EP3898175B1
EP3898175B1 EP19845607.1A EP19845607A EP3898175B1 EP 3898175 B1 EP3898175 B1 EP 3898175B1 EP 19845607 A EP19845607 A EP 19845607A EP 3898175 B1 EP3898175 B1 EP 3898175B1
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EP
European Patent Office
Prior art keywords
preform
active
electric actuator
move
ejection
Prior art date
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Active
Application number
EP19845607.1A
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German (de)
English (en)
French (fr)
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EP3898175A1 (fr
Inventor
Sébastien FEVRE
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Sidel Participations SAS
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Sidel Participations SAS
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Publication of EP3898175A1 publication Critical patent/EP3898175A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42101—Conveyors, e.g. flat conveyor or clamping between two bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42095—Rotating wheels or stars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • B29C49/42085—Grippers holding inside the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a device for conveying preforms and a method for controlling such a device.
  • the invention relates more particularly to a device for conveying preforms made of thermoplastic material for a thermal conditioning furnace, said device for conveying preforms comprising at least one main wheel and one auxiliary wheel, at least one of which is driven in rotation to move at least one means of transport to which are linked in movement a plurality of gripping means each configured to cooperate with a preform, actuating means controlled to selectively move each of said gripping means with respect to a preform - or vice versa - between a inactive position and an active gripping position.
  • the invention also relates to a method for controlling such a preform conveying device.
  • a preform is a hollow body obtained by injection of thermoplastic material, in particular PET (polyethylene terephthalate), which comprises a generally cylindrical body ending in a hemispherical bottom, a neck having its final shape and a radial flange separating the neck from the body.
  • PET polyethylene terephthalate
  • the raw injection preforms are ordinarily stored in bulk in a hopper.
  • the document WO-03/084818 describes an example of a preform feeder used in a container manufacturing facility. Another example is described in the document DE102011081726A1 .
  • the preforms are first taken from the hopper, then oriented and ordered in line and finally transferred by a wheel to be introduced into a thermal conditioning unit (commonly called an "oven") additionally equipped with heating means, such as as infrared or laser emitters, inside which the preforms are heated to a temperature above their glass transition temperature (which is approximately 80° C. for PET).
  • a thermal conditioning unit commonly called an "oven”
  • heating means such as as infrared or laser emitters
  • the hot preforms are then transferred to a molding unit (also called a "blower") equipped with a plurality of molds in which the preforms are formed in the cavity of the containers by blow molding or stretch-blow molding.
  • a molding unit also called a "blower” equipped with a plurality of molds in which the preforms are formed in the cavity of the containers by blow molding or stretch-blow molding.
  • the preforms (or the receptacles) are conveyed between the various units ensuring the manufacturing steps by transfer wheels of which numerous embodiments are known, in particular transfer wheels comprising a plate with notches or even comprising pliers.
  • the conveying device integrated into the furnace is continuously supplied with preforms by a transfer wheel, generally of the notched type, located upstream of the main wheel of the furnace and, after their thermal conditioning, the preforms are then evacuated by another wheel.
  • transfer generally of the gripper type, located downstream of the main wheel.
  • the preforms are first transferred from the transfer wheel supplying the oven to the conveying device according to a loading operation, also called “clothing”, then are then transferred from the conveying device to the other transfer wheel according to an unloading operation, also called “stripping”.
  • a loading operation also called “clothing”
  • an unloading operation also called “stripping”.
  • the device for conveying the preforms inside the oven is designed to transport the preforms in line with a given pitch (or spacing) between two consecutive preforms and following a path along at least a part of which are arranged the means of heating of the body of the preforms.
  • the document WO-2017/060654 describes and represents an embodiment of a preform conveying device for a thermal conditioning furnace.
  • the conveying device comprises at least one transport means such as a chain comprising a plurality of links each having a plate on which said means for gripping a preform are mounted.
  • the spinner forming the gripping means comprises a sleeve fixed to the plate and a chuck provided with a gripping head.
  • the mandrel is mounted to move in translation relative to the sleeve between an inactive position in which the head is housed in the sleeve, and an active position in which the head protrudes with respect to an underside of the sleeve, in particular to come s to fit, fit into the neck of a preform.
  • the spinner is generally driven by rotation on itself, therefore with respect to the plate, by means of a rack which meshes with a pinion integral with the mandrel during the translation of the transport chain.
  • the preform fitted onto the head of the mandrel is driven both in translation and in rotation in the oven, so as to fully expose its body to infrared or laser radiation from the heating means.
  • Such a transport chain is usually mounted between two wheels, respectively a main wheel and an auxiliary wheel, the main wheel at least being driving, that is to say leading, in order to drive said transport chain in a closed loop.
  • the translational movement of the gripping means, more particularly of the mandrel, between said inactive and active positions is controlled by actuating means consisting of a mechanical cam and roller system.
  • the production rate in a container manufacturing installation is high, generally greater than 50,000 containers per hour, which corresponds to the rate at which the preforms pass through the oven.
  • the document FR-2.872.805 describes an example of such an ejection mechanism for ejecting preforms.
  • a jack is controlled to raise the mandrel of the spinner and allow the ejection of the preforms.
  • the object of the invention is in particular to propose a new design of conveying device making it possible to solve at least some of the drawbacks of the state of the art while retaining a conveying device which is capable of operating reliably at high speeds.
  • the invention proposes a conveying device of the type described above, characterized in that said actuating means comprise electric actuators which are mounted on said main wheel of the conveying device.
  • an electric actuator advantageously makes it possible to eliminate the use of grease and consequently the risks of projection while as the associated maintenance interventions.
  • the electric actuator makes it possible to selectively eject a single preform and no longer a group of several preforms as was the case hitherto with an ejection device according to the state of the art.
  • each electric actuator can be controlled individually, independently of the other electric actuators on board the main wheel.
  • the control of an electric actuator to move the gripping means relative to a preform is carried out selectively and not systematically as with a mechanical cam and roller system. .
  • control of an electric actuator to carry out the operation of clothing a preform is selectively controlled, for example according to manufacturing data such as data related to the operation of the production line. production downstream and/or upstream of the thermal conditioning furnace.
  • the targeted ejection of at least one preform is made possible by the individual control of at least one of the electric actuators on board the main wheel of the transport device.
  • the selective ejection of a preform is notably but not exclusively carried out when a preform is badly taken at the inlet of the oven.
  • an ejection can also be carried out at the exit of the oven when a heated preform is detected as being non-compliant.
  • an electric actuator not only offers great flexibility compared to the state of the art, but also new possibilities such as that of selectively controlling the clothing and/or stripping operation.
  • the electric actuators forming the actuating means offer great ease of parameterization when modifications of the operating parameters (stroke, speed, etc.) are required, typically in the event of a change of application to manufacture containers with other preforms.
  • the invention also proposes a method for controlling a preform conveying device made of thermoplastic material for a thermal conditioning furnace, said conveying device comprising at least one main wheel on which are embedded electric actuators which are each capable of moving gripping means relative to a preform - or conversely a preform relative to gripping means - between an inactive position and an active gripping position, characterized in that the control method comprises at least one step of dressing consisting in selectively controlling the actuator electric to a point of dressing of the main wheel to move the gripping means or the preform from the inactive position to the active gripping position.
  • control method comprises at least one stripping step consisting in selectively controlling the electric actuator at a point of stripping of the main wheel to move the gripping means or the preform from the active gripping position until the inactive position.
  • control method comprises at least one ejection step consisting in selectively controlling the electric actuator on an ejection section of the main wheel to move the gripping means or the preform from the active position until the inactive position in order to cause the ejection of the preform.
  • said at least one ejection step is performed on an ejection section located downstream of the point of clothing.
  • said at least one ejection step is performed in an ejection section located upstream of the stripping point.
  • the longitudinal and transverse orientations are determined in a fixed manner with respect to the axis of a preform or the axis of rotation of a wheel.
  • front and “rear” will also be used, without limitation, in reference to the longitudinal orientation, as well as “upper” and “lower” or “top” and “bottom” in reference to the vertical orientation and finally “left” and “right” in reference to the transverse orientation.
  • inner or outer and “inner” or “outer” are respectively used with respect to a preform or a wheel in a general manner, in particular to designate an element located either inside or outside the preform.
  • upstream and downstream are respectively used in reference to the flow of preforms which are transported from upstream to downstream.
  • an oven 100 for thermal conditioning of preforms 10 made of thermoplastic material is Schematically represented on the figure 1 .
  • the oven 100 constitutes one of the units comprising an installation (not shown) for manufacturing containers from preforms 10 made of thermoplastic material.
  • the oven 100 comprises heating means 101, such as infrared emitters, of the halogen lamp or laser diode type, intended to heat a body 12 of the preforms 10 conveyed inside the oven.
  • heating means 101 such as infrared emitters, of the halogen lamp or laser diode type, intended to heat a body 12 of the preforms 10 conveyed inside the oven.
  • the preforms 10 follow a "U"-shaped path in the furnace 100 comprising successively from upstream to downstream a straight heating section, called penetration, a curvilinear section, called stabilization, and a straight heating section, said distribution.
  • the heating means 101 are arranged on the two heating sections of the route, respectively penetration and distribution.
  • the preform 10 mainly comprises a hollow body 12 which, provided with a neck 14, extends axially along a main axis O.
  • the body 12 of the preform 10 is closed at one end by a bottom 16 and comprises axially, at the opposite end, an opening 18 delimited by an edge 19 of the neck 14, said edge 19 being also called “drinking".
  • the preform 10 includes a flange 20 which extends radially projecting outwards, at the level of the junction of the neck 14 with the body 12.
  • the preform 10 is manufactured by injection molding of thermoplastic material, in particular PET (polyethylene terephthalate), so that the neck 14 has its final shape, ie that of the neck of the container.
  • PET polyethylene terephthalate
  • the neck 14 of the preform 10 according to the example is provided with a thread in order to allow subsequent closure of the container by a complementary screw cap.
  • the preform 10 comprises an internal surface 22 which extends axially from the bottom 16 to the edge 19 of the neck 14 delimiting the opening 18.
  • the body 12 of the preform 10 comprises an external surface 24.
  • the preform 10 occupies a so-called “neck-up” position corresponding to the position in which each preform 10 is preferentially transported through the installation.
  • each preform 10 is conveyed here in the "neck-up" position in the oven 100.
  • the preforms 10 could be conveyed in the "neck down” position, in particular to be heated, the changes of orientation between said "neck up” and “neck down” positions being carried out using means reversal well known in the state of the art.
  • the manufacture of a container, such as a bottle, from a preform 10 made of thermoplastic material previously manufactured comprises a step of thermal conditioning of the body 12 of the preform 10 which is carried out in the oven 100.
  • the furnace 100 comprises a device 102 for conveying preforms 10 comprising at least one main wheel 104 and one auxiliary wheel 106, at least one of which is driven in rotation.
  • the main wheel 104 and the auxiliary wheel 106 respectively have an axis A1 of rotation and an axis A2 of rotation.
  • the main wheel 104 is driven in rotation by a motor (not shown) and the auxiliary wheel 106 is connected in rotation to said main wheel 104 by transmission means, such as a belt, in order to be driven from synchronously.
  • transmission means such as a belt
  • the oven 100 is supplied with preforms 10 by a supply device 108 which, represented schematically by an arrow on the figure 1 , comprises at least one wheel 110 of transfer, called input, having an axis 02 of rotation
  • Another transfer wheel 112 is arranged downstream of the main wheel 104 to transport the preforms 10 downstream of the heat conditioning furnace 100 .
  • the hot preforms 10 are transported to a molding unit (not shown), also called a "blower", in which each preform 10 is transformed into a container in a mold by blow molding or by stretch-blow molding. .
  • the transport of the preforms 10 to the molding unit is for example ensured by at least one other gripper-type transfer wheel 116 represented schematically by an arrow on the figure 1 and which is arranged downstream of the wheel 112.
  • said transfer wheels 110 and 112 are provided with a plurality of notches 114 which are distributed circumferentially in a regular manner around their axis O1 and O2 of rotation.
  • the device 102 for conveying preforms 10 comprises at least one transport means 118 .
  • the transport means 118 comprises at least one chain comprising a plurality of links each having a plate on which are mounted means 120 for gripping.
  • the conveying device 102 comprises a plurality of gripping means 120 which are thus linked in movement to the conveying chain 118 driven in a closed loop.
  • each of the gripping means 120 of the conveying device 102 being identical, the description of one applies to the others.
  • a gripping means 120 comprises, in the first place, a sleeve 122 fixed to a plate (not shown), possibly with the possibility of rotation, of the chain 118 of transport.
  • the sleeve 122 advantageously comprises a tubular sleeve 124 which extends through a yoke (not shown), with play (to allow rotation of the sleeve 122 relative to the plate), or in a tight manner (for, at the contrary, make the sleeve 122 integral with the plate).
  • Sleeve 124 includes a central bore 126 which defines a vertical X axis.
  • the transport chain 118 has been shown schematically without detailing the entire structure such as the plate or the yoke.
  • the sleeve 122 has an enlarged section which is extended by a cylindrical skirt 128 having, at a lower end, an annular lower face 130 .
  • the sleeve 122 carries for example a ring (not shown) which ensures, together with the widened section, the fixing in translation of the sleeve 122 relative to the plate.
  • a gripping means 120 comprises, secondly, a mandrel 132 mounted to move in translation, along the vertical axis X, relative to the sleeve 122.
  • the mandrel 132 comprises a cylindrical rod 134 mounted in free rotation around the axis X in the bore 126 of the sleeve 122, preferably with the interposition of bearings (not shown) to reduce friction.
  • Chuck 132 includes, at a lower end of shank 134, a larger diameter head 136, which extends into skirt 128 of sleeve 122.
  • the mandrel 132 is mounted not only in free rotation relative to the sleeve 122, but also in translation, between an active position ( picture 2 ) in which the head 136 protrudes with respect to the lower face 130 of the sleeve 122 to fit into the neck 14 of a preform 10 and an inactive position ( picture 3 ), in which the head 136 is retracted inside the skirt 128.
  • the preform 10 is transported in a neck position 14 at the top, the active position of the gripping means 120 corresponds vertically, along the X axis, to a low position and the inactive position of the gripping means 120 at a high position.
  • the gripping means 120 comprises a return spring 138 which, interposed between the head 136 of the mandrel 132 and the sleeve 122, operates in compression.
  • the spring 138 is interposed between an upper face of the head 136 and a counterbore formed in the enlarged section of the sleeve 122.
  • the return spring 138 urges the gripping means 120 towards the active position, more precisely the spring 138 provides automatic return to the active position.
  • the return spring 138 guarantees the position occupied by the movable part of the gripping means 120 formed by the mandrel 132, the rod 134 of which includes the gripping head 136, with respect to the fixed part formed by the sleeve 122.
  • the head 136 of the mandrel 132 is advantageously provided with an O-ring (not shown), preferably made of an elastic material such as an elastomer.
  • the head 136 of the mandrel 132 thus has an external diameter which is equal to or slightly greater than the internal diameter of the neck 14 of a preform 10, so as to ensure the lift of the preform 10 by friction (or friction) against the surface 22 inside the neck 14, when said head 136 is in the active position as shown in the figure 2 .
  • the mandrel 132 is provided with an actuating member 140 which, generally having the shape of a coil, is mounted on the rod 134, fixed in rotation thereto.
  • the actuating member 140 comprises a pinion 142, a barrel 143 at one end of which said pinion 142 extends and, opposite the latter, a flange 144, here of smaller diameter than the pinion 142.
  • the actuating member 140 is made in one piece, in one piece.
  • the pinion 142 is intended to mesh with meshing means (not shown), such as a rack, which extend along all or part of the "U" shaped heating path inside the oven 100 so as to drive the mandrel 132 of the gripping means 120 in rotation to expose the entire body 12 of the preform 10 to infrared radiation.
  • meshing means such as a rack
  • a rack depends on the applications, in particular on the type of containers to be manufactured. For certain applications, called “preferential heating", the rack is removed so that, in the absence of meshing of the pinion 142, the preform 10 is then not driven in rotation on itself around its axis O .
  • the actuating member 140 is intended to cooperate with a connecting endpiece 146 which is integral with a rod 148 that comprises actuating means 150 capable of controlling selectively in movement between said active and inactive positions one of the gripping means 120.
  • the connecting piece 146 is configured to cooperate with the actuating member 140 so as to produce a mechanical-type connection in order to control the gripping means 120 between the active position ( picture 2 ) and idle position ( picture 3 ), by driving vertically in translation the mandrel 132 relative to the sleeve 122.
  • the connecting piece 146 comprises an upper part 152 for fixing it to the free end of the rod 148 of the actuating means 150.
  • the connecting piece 146 has a generally “C” shape.
  • the upper fixing part 152 is extended by a body 154 which, offset with respect to the axis X, extends globally vertically and from the lower end of which extend radially two arms 156 defining between them a housing 158 .
  • the endpiece 146 is intended to engage radially with the actuating member 140
  • the housing 158 is configured to receive the barrel 143, the arms 156 engaging on either side of said barrel 143 which s extends vertically between flange 144 and pinion 142.
  • the arms 156 are intended to exert on the underside of the flange 144 a tensile force, vertically upwards, to drive the mandrel 132 in displacement from the active position to the inactive position.
  • the actuating means 150 comprise a connecting end piece 145 which is capable of being magnetically linked with the member 140 for actuating the means 120 for gripping preforms 10.
  • At least one of the two parts among the connecting piece 145 and the actuating member 140 is made of a magnetic material, the other of a metallic material.
  • the connecting piece 145 comprises for example one or more magnets capable of exerting on the actuating member 140 a force F of magnetic attraction to bind them at least vertically when moving.
  • the magnetic connection makes it possible to link in translation the end piece 145 for connecting the means 150 for actuating with the member 140 for actuating the means 120 for gripping.
  • the connecting piece 145 comprises at least one part made of a magnetic material, said connecting piece 145 comprising for example one or more magnets.
  • such a connecting endpiece 145 is intended to cooperate magnetically with the flange 144 of the actuating member 140, the flange 144 being preferably made of a metallic material such as steel or an alloy.
  • the connecting endpiece 145 includes at least one electromagnet.
  • an electromagnet is selectively controlled to apply a magnetic attraction force to the actuating member 140.
  • a magnetic connection makes it possible to reduce certain operating constraints such as the adjustments necessary to guarantee the engagement of the connecting piece 146 forming a fork with the actuating member 140 .
  • the connecting piece 145 according to the variant of the figure 5 like the connecting piece 146 according to the first embodiment of the figures 2 to 4 are respectively integral with the rod 148 intended to be moved by the actuating means 150.
  • the means 150 for actuating each of the gripping means 120 are formed by at least one electric actuator 160.
  • the electric actuators 160 are embedded on said main wheel 104 of the device 102 for conveying.
  • the electric actuator 160 comprises a linear motor for driving the rod 148 in translation in order to selectively control the gripping means 120 between the inactive and active positions, in particular during the dressing and undressing maneuvers.
  • the electric actuators 160 are distributed circumferentially in a regular manner over the periphery of the main wheel 104 of the conveying device 102 .
  • the electric actuators 160 are arranged with a spacing or “pitch” corresponding to the spacing between two consecutive gripping means 120 carried by the transport chain 118 .
  • the electric actuators 160 are selectively controlled to move said gripping means 120 relative to the preform 10 as a function of their angular position around the axis A1 of rotation of the main wheel 104 .
  • the gripping means 120 are mounted to move relative to a preform 10 which is "fixed", said gripping means 120 being moved vertically between an active position and an inactive position.
  • the preform 10 Before its clothing, the preform 10 supported via its flange 20 which is housed in one of the notches 114 of the transfer wheel 110 arranged at the inlet of the oven 100. The preform 10 is brought by the transfer wheel 110 but the preform 10 is fixed in the vertical direction relative to the means 120 for gripping.
  • the clothing operation is the initial step during which a preform 10 transported by the transfer wheel 110 is brought to the inlet of the oven 100 to be taken over by the conveying device 102 .
  • the preform 10 is brought by the transfer wheel 110 driven in rotation around its axis O2 up to point V, called the point of dressing, which is indicated on the figure 1 .
  • the preform 10 is positioned directly above one of the gripping means 120 (or “turner") occupying the inactive position represented on the picture 3 .
  • the gripping means 120 linked in movement to the transport chain 118 are driven in a closed loop via the main wheel 104 and the auxiliary wheel 106 of the conveying device 102 .
  • the on-board electric actuators 160 are also moved synchronously due to the rotational drive of the main wheel 104 around its axis A1 of rotation.
  • the gripping means 120 When the gripping means 120 arrive at the point V of clothing, the gripping means 120 are in the inactive position.
  • the electric actuator 160 is controlled to maintain the gripping means 120 in the inactive position.
  • the electric actuator 160 then acts on the means 120 for gripping preforms and this via the rod 148 and the connecting piece 146 cooperating with the actuating member 140 so as to mechanically couple the electric actuator 160 with the gripping means 120.
  • the electric actuator 160 is controlled to exert via the connecting piece 146 a tensile force on the actuating member 140, more precisely on the flange 144, and this against of the return spring 138 of the mandrel 132 whose rod 134 is integral with the member 140 for actuation.
  • the return spring 138 of the mandrel 132 is then compressed and the gripping head 136 is retracted inside the skirt 128 of the sleeve 122 so that nothing advantageously extends beyond the lower face 130 .
  • the electric actuator 160 is controlled to move the gripping means 120 from the inactive position occupied hitherto towards the active position so that the mandrel 132 slides vertically from top to bottom.
  • the head 136 fits inside the opening 18 of the neck 14 of the preform 10 which is secured to the gripping means 120.
  • the preform 10 is then conveyed to point C where the electric actuator 160 and the gripping means 120 will separate to each continue their movement.
  • the connecting piece 146 will disengage radially from the member 140 for actuating the gripping means 120, which means 120 of prehension will continue their journey inside the oven 100.
  • Each preform 10 in engagement by its neck 14 with the head 136 of one of the gripping means 120 will carry out, in the "neck up" position, a path inside the furnace 100 comprising successively the penetration heating section, the stabilization section then the distribution heating section.
  • the preforms 10 are conveyed in the so-called "neck-up" position over at least part of said path inside the oven 100.
  • the angular sector centered on the axis A1 and extending between the point V of clothing and the point C constitutes an ejection section E.
  • a preform 10 is capable of being ejected at any time by controlling the electric actuator 160 to move the gripping means 120 upwards, from the active position to the inactive position.
  • the electric actuator 160 therefore makes it possible to proceed selectively with the ejection of a single preform 10 and no longer necessarily of a group of preforms as was the case hitherto in the state of the art, in due in particular to the high production rates.
  • Such an ejection is for example carried out in the event of detection of a defect in the dressing of the preform 10, when the head 136 of the mandrel 132 is incorrectly positioned in the neck 14.
  • a badly taken preform 10 is likely to cause damage to the furnace 100, in particular to the infrared emitters.
  • This type of fault can be detected by a sensor (not shown) external to the assembly formed by the electric actuator 160 and the means 120 for gripping.
  • Such a sensor can be a position sensor, in particular an inductive sensor detecting a reference position of the mandrel 132 or an encoder of the electric actuator 160 also giving the reference position of the mandrel 132.
  • the ejection of a preform 10 is obtained in the same way as its stripping, the electric actuator 160 is controlled to exert, via the connecting piece 146, an upward tensile force on the flange 144 of the member 140 for actuating the gripping means 120.
  • the upper edge 19 of the neck 14 then comes into abutment against the lower face 30 of the skirt 128 of the sleeve 122 to cause the extraction of the head 136 from the neck 14 and consequently the ejection of the preform 10.
  • each preform 10 supported by gripping means 120 is conveyed into the oven 100 by the transport chain 118 of the conveying device 102 and successively traverses the penetration, stabilization and distribution sections.
  • one of the electric actuators 160 that the means 150 comprise actuation embedded on the main wheel 104 will again come to cooperate with one of the gripping means 120 linked in movement to the chain 118 of transport.
  • the arms 156 of the connecting piece 146 engage radially around the barrel 143 of the member 140 for actuating the gripping means 120 which are in the active position.
  • the electric actuator 160 is controlled to perform stripping of the hot preform 10 which will then be taken over by one of the notches 114 of the transfer wheel 112 or one of the clamps (not shown) a transfer wheel 112 in order to be transported downstream to the molding unit or "blower" (not shown).
  • the stripping operation is obtained by controlling the electric actuator 160 to exert a tensile force on the actuating member 140 in order to move the gripping means 120 from the active position to the inactive position.
  • the angular sector centered on the axis A1 and extending between the point D′ and the stripping point D constitutes another ejection section E′.
  • the ejection of a preform 10 can be obtained by selectively controlling the electric actuator 160 so as to strip the preform 10 before reaching the point D of stripping.
  • the ejection of a preform 10 is obtained in the same way as that described previously for the ejection section E and makes it possible, for example, to eliminate before its transfer a preform 10 whose heating profile has been detected as being non-compliant. , for example by detection means such as a thermal camera.
  • the ejection of at least one preform 10 can also be implemented in a similar manner on the auxiliary wheel 106 .
  • the auxiliary wheel 106 advantageously comprises electric actuators 160 capable of being selectively controlled to move, relative to the preform 10, the gripping means 120 in order to eliminate said preform 10.
  • the electric actuator 160 is advantageously controlled to maintain the gripping means 120 in the inactive position, that is to say to exert a tensile force on the actuating member 140 at against the return spring 138 so that the head 136 is retracted inside the skirt 128 of the sleeve 122.
  • the gripping means 120 are thus maintained in the inactive position illustrated in picture 3 between the stripping point D and the dressing point V so as to allow a preform 10 intended to be picked up and transported by the transfer wheel 110 to come and position itself directly above the gripping means 120, without interference in particular with the gripping head 136.
  • the operation of the gripping means 120 controlled in movement by the electric actuator 160 during the dressing and stripping operations, or even ejection, is analogous when the connection between the actuating means 150 and the actuating member 140 is magnetic, for example with a connecting piece 145 according to the figure 5 , not mechanical.
  • the electric actuator 160 is controlled to drive in translation gripping means 120 relative to a preform 10, however this is only one of the possibilities.
  • an electric actuator could conversely be used to drive the preform 10 in displacement relative to gripping means.
  • the figure 6 and 7 illustrate a second embodiment in which electric actuators 260 are mounted on the main wheel 104 of the conveying device 102 to drive a preform 10 in displacement relative to means 220 for gripping.
  • the preform 10 is driven in displacement by actuating means 250 comprising an electric actuator 260.
  • Each electric actuator 260 is selectively controlled to drive a preform 10, respectively between an inactive position in which the preform 10 is free with respect to the gripping means 220 and an active position in which the preform 10 is taken, integral with the gripping means 220 .
  • the gripping means 220 comprise a shaft 222 which is integral with a means of transport such as a chain 218 shown schematically.
  • the shaft 222 of the gripping means 220 is immobile vertically but is advantageously capable of being rotated by means of an actuating member 224 arranged at the upper end of the shaft 222.
  • the actuating member 224 comprises at least one pinion 226 intended to cooperate with complementary meshing means (not shown) such as a rack in order to drive the shaft 222 in rotation on itself around of the X axis.
  • complementary meshing means such as a rack
  • the gripping means 220 comprises a gripping head 228 which, arranged at the lower end of the shaft 222, is configured to fit inside the neck 14 of a preform 10.
  • the actuating means 250 comprise, for example, a connecting means 252 connecting an electric actuator 260 to means for gripping a preform 10, such as a gripper 254.
  • the clamp 254 is configured to cooperate with the collar 20 of the preform 10.
  • the clamp 254 is capable of exerting on the flange 20 a tensile force oriented vertically downwards in order to carry out a stripping or an ejection of the preform 10.
  • the invention also proposes a method for controlling a device 102 for conveying a preform 10 made of thermoplastic material for a thermal conditioning furnace 100, said conveying device 102 comprising at least one main wheel 104 on which are embedded electric actuators 160 which are each capable of moving gripping means 120 relative to a preform 10 - or conversely a preform 10 relative to gripping means 120 - between an inactive position and an active gripping position, characterized in that the method of control comprises at least one clad step consisting in selectively controlling the electric actuator 160 at a point V of clad of the main wheel 104 to drive the gripping means 120 or the preform 10 in displacement from the inactive position to the position active gripping.
  • control method comprises at least one stripping step consisting in selectively controlling the electric actuator 160 at a point D of stripping of the main wheel 104 to drive in moving the gripping means 120 or the preform 10 from the active gripping position to the inactive position.
  • control method comprises at least one ejection step consisting in selectively controlling the electric actuator 160 on an ejection section E, E′ of the main wheel 104 to move the gripping means 120 or the preform 10 from the active position to the inactive position in order to cause the ejection of the preform 10.
  • said at least one ejection step is carried out on an ejection section E located downstream of the point V of clothing.
  • said at least one ejection step is performed in an ejection section E′ located upstream of the stripping point D.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP19845607.1A 2018-12-19 2019-12-18 Dispositif de convoyage de préformes pour un four et procédé de commande d'un tel dispositif Active EP3898175B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1873397A FR3090604B1 (fr) 2018-12-19 2018-12-19 « Dispositif de convoyage de préformes pour un four et procédé de commande d’un tel dispositif »
PCT/FR2019/053142 WO2020128319A1 (fr) 2018-12-19 2019-12-18 Dispositif de convoyage de préformes pour un four et procédé de commande d'un tel dispositif

Publications (2)

Publication Number Publication Date
EP3898175A1 EP3898175A1 (fr) 2021-10-27
EP3898175B1 true EP3898175B1 (fr) 2023-01-25

Family

ID=66530266

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Application Number Title Priority Date Filing Date
EP19845607.1A Active EP3898175B1 (fr) 2018-12-19 2019-12-18 Dispositif de convoyage de préformes pour un four et procédé de commande d'un tel dispositif

Country Status (4)

Country Link
EP (1) EP3898175B1 (zh)
CN (1) CN113260496B (zh)
FR (1) FR3090604B1 (zh)
WO (1) WO2020128319A1 (zh)

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FR2755387B1 (fr) 1996-11-04 2000-03-03 Cornet Maurice Chaine de manipulation
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CN1073502C (zh) * 1999-05-07 2001-10-24 华南理工大学 步进式吹瓶机自动上坯装置及其自动上坯方法
CN1335219A (zh) * 2000-07-25 2002-02-13 徐光中 吹瓶机的输送装置
JP3874173B2 (ja) * 2002-01-28 2007-01-31 株式会社吉野工業所 プリフォーム搬送装置
FR2838076B1 (fr) 2002-04-04 2005-03-04 Sidel Sa Procede et installation pour la decontamination des cols de preformes
FR2872805B1 (fr) 2004-07-08 2006-09-01 Sidel Sa Sa Systeme de convoyage de preformes comportant un moyen d'ejection des preformes mal saisies
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FR2903965B1 (fr) * 2006-07-20 2008-12-05 Sidel Participations Dispositif de support individuel d'un recipient pourvu d'un col et installation pourvue de dispositifs de transport avec un tel dispositif de support.
FR2915475B1 (fr) * 2007-04-30 2009-07-31 Sidel Participations Dispositif de transfert et installation de type lineaire pour la fabrication de recipients
DE102008062315A1 (de) * 2008-12-11 2010-06-17 Khs Corpoplast Gmbh & Co. Kg Verfahren und Vorrichtung zur Übergabe von Werkstücken
DE102010001192A1 (de) * 2010-01-25 2011-07-28 Krones Ag, 93073 Etikettiervorrichtung und -verfahren zum Etikettieren von Kunststoffbehältern in der Blasform in einer Rundläufer-Blasmaschine
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FR3027886A1 (fr) * 2014-11-03 2016-05-06 Sidel Participations "dispositif de transport de preformes dans un four de conditionnement thermique"
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DE102016113875B4 (de) * 2016-07-27 2019-07-18 Khs Corpoplast Gmbh Heizvorrichtung für eine Blasmaschine mit Förderkette für einen zweireihigen Transport der Vorformlinge

Also Published As

Publication number Publication date
CN113260496B (zh) 2023-07-25
FR3090604B1 (fr) 2020-11-27
CN113260496A (zh) 2021-08-13
FR3090604A1 (fr) 2020-06-26
WO2020128319A1 (fr) 2020-06-25
EP3898175A1 (fr) 2021-10-27

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